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Question

In a cylinder, if the radius is halved and the height is doubled, then the volume will be
(a) the same
(b) doubled
(c) halved
(d) four times


Solution

(c) halved

Suppose that the new radius is 12r and the height is 2h.
 Volume =π×12r2×2h             =π×r24×2h             =12πr2h 

Mathematics
RS Aggarwal (2017)
Standard IX

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